the problem is that at least the msvc_win32_x86-64 bridge's 
unoInterfaceProxyDispatch 
(bridges/source/cpp_uno/msvc_win32_x86-64/uno2cpp.cxx) 
requires pUnoReturn to be a nullptr when the UNO method has VOID 
return type (see computation of retKind in cpp_call in the same file), 
but that IdlInterfaceMethodImpl::invoke doesn't set up the arguments 
according to that expectation.


Change-Id: I187a997300571cd9822de2eeacf7ad887ad00a4f
Reviewed-on: https://gerrit.libreoffice.org/69495Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>